finish spec examples for spec for SecureTokenValidator#validate_encrypted_key_format, condense some redundant spec logic
finish spec examples for spec for SecureTokenValidator#validate_encrypted_key_format, condense some redundant spec logic

UM-USElab/gradecraft-development,UM-USElab/gradecraft-development,UM-USElab/gradecraft-development,UM-USElab/gradecraft-development